The Earth was facing an unprecedented energy crisis. If there was a possibility of solving it, then it should be underground… Surprisingly, no one knows what the underground is like. 20XX year. Humanity finally fell into complete resource depletion, and the Earth itself gradually declined. While energy development in space and underwater has seen little success, humanity suddenly turned its attention to geothermal energy. I too joined a land price survey project in search of new energy. And then, from the depths of a cave in a certain primeval forest, we successfully captured the life form we were seeking.
